lecture4 - 2/28 Respiratory physiology 1. what is the...

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2/28 Respiratory physiology 1. what is the response of the respiratory system to an acute bout of exercise?— ventilation goes up 2. How that helps the body adjust to disruption in homeostasis?—ventilation goes up, gas exchagne 3. What regulates these changes that happen during exercise? 4. Any training adaptations? Function: to make sure blood is properly oxygenated, eliminates waste produces (Co2) from body Anatomy: bronchial tree 1. main, secondary, tertiary bronch. Are coated with cartilage (support). Once get to respiratory zone—have a terminal bronchiole, surrounded by smooth muscle (can contract, close off bronchile passway, or relax, dilate open up and increase air flow. Also gas exchange takes place in alveoli sacs in respiratory zone 2. blood flow—capillaries max SA and gas exchange btwn capillaries and alveoli sacs. From heart to lungs (via pulm artery) have blood low in O2, gas exchange takes place, returns abck to heart (via pulm vein) has O2 blood flowing back to heart, pumped out via systemic circulation structure of respiratory membrane: poorly O2 blood-high in CO2 alveolus wall co2 goes from blood vessel into alveolus to be respired. Respiratory membrane is THIN. Because of this, we can have rapid diffusion of o2 and co2 across membrane PULMONARY VENTILATION Exchange of air between atmosphere and lungs BOYLES LAW: pressure is cause by gas molec. Striking container-larger volume, fewer pressure. Decreased volume=increase pressure. Law states the pressure of a gas is inversely proportional to volume of container. Increase volume decreases pressure, decrease volume increases pressure. Muscle involved: diaphram contracts, increases the vol decrease the pressure within the thoracic cavity and the lungs. Air diffuses down pressure gradient into lungs. Expiration—diaphram relaxes, (-) pressure is removed, air is forced out of lungs Muscles involved in DEEP inspiration and expiration—DURING EXERCISE! Events during inspiration: diaphram and external intercostals muscles contracts, vol of th cavity increase, intrapleural pressure becomes negative, lungs expand, intrapulmonary pressure becomes
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negative, air flows into the lungs. Tidal vol-amt of air inspired per each breath expiration: diaphram relaxes, vol of th cav decrease, lungs recoil, intra press rises, air flows out of lungs other factors affecting ventilation: 1. resistance within the airways 2. lung compliance resistance within airways- diameter of the airway affects resistance. Contraction-restrict
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This note was uploaded on 03/18/2009 for the course IPHY 4650 taught by Professor Robertmazzeo during the Spring '09 term at Colorado.

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lecture4 - 2/28 Respiratory physiology 1. what is the...

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